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RIGHT OF USE ASSETS AND LEASES - Right-of-use assets (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance R 44.9  
Additions 16.7 R 18.0
Lease modifications 2.3 7.5
Closing balance 49.1 44.9
Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 56.1  
Transfers and other movements   26.5
Additions 16.7 18.0
Lease modifications 2.3 7.5
Lease derecognitions (1.0) (26.8)
Closing balance 74.1 56.1
Gross carrying amount [member] | Financial Effect Of Changes In Accounting Policy [Member] | IFRS 16 [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance   30.9
Accumulated depreciation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance (11.2)  
Transfers and other movements   (15.9)
Depreciation (14.8) (13.2)
Lease derecognitions 1.0 17.9
Closing balance (25.0) (11.2)
Mine plant facilities and equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 8.2  
Closing balance 20.6 8.2
Mine plant facilities and equipment [member] | Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 11.1  
Transfers and other movements   26.5
Additions 16.7 3.8
Lease modifications 0.0 0.0
Lease derecognitions (1.0) (26.7)
Closing balance 26.8 11.1
Mine plant facilities and equipment [member] | Gross carrying amount [member] | Financial Effect Of Changes In Accounting Policy [Member] | IFRS 16 [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance   7.5
Mine plant facilities and equipment [member] | Accumulated depreciation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance (2.9)  
Transfers and other movements   (15.9)
Depreciation (4.3) (4.9)
Lease derecognitions 1.0 17.9
Closing balance (6.2) (2.9)
Mine property and development [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 36.7  
Closing balance 28.5 36.7
Mine property and development [member] | Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 45.0  
Transfers and other movements   0.0
Additions 0.0 14.2
Lease modifications 2.3 7.5
Lease derecognitions 0.0 (0.1)
Closing balance 47.3 45.0
Mine property and development [member] | Gross carrying amount [member] | Financial Effect Of Changes In Accounting Policy [Member] | IFRS 16 [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance   23.4
Mine property and development [member] | Accumulated depreciation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance (8.3)  
Transfers and other movements   0.0
Depreciation (10.5) (8.3)
Lease derecognitions 0.0 0.0
Closing balance R (18.8) R (8.3)